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Share-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
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May 31, 2018 | May 31, 2016 | May 31, 2013 | May 31, 2010 | Apr. 30, 2006 | Apr. 30, 2005 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation vested in period, fair value |  |  |  |  |  |  | $ 12,577 | $ 8,718 | $ 5,394 |  |
Tax benefit realized from stock based compensation |  |  |  |  |  |  | $ 1,584 | $ 858 | $ 977 |  |
Time Based Awards [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common shares, forfeited or cancelled |  |  |  |  |  |  | (16,821) | (36,342) |  |  |
Share-based compensation restricted common shares issued |  |  |  |  |  |  | 107,510 |  |  |  |
Weighted average grant date fair value, granted |  |  |  |  |  |  | $ 24.69 | $ 18.73 | $ 13.52 |  |
Unrecognized compensation expense |  |  |  |  |  |  | $ 3,321 |  |  |  |
Employee service share-based compensation, nonvested, period for recognition |  |  |  |  |  |  | 1 year 1 month 28 days |  |  |  |
Performance Based Awards [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common shares, forfeited or cancelled |  |  |  |  |  |  | (46,996) | (132,664) |  |  |
Share-based compensation restricted common shares issued |  |  |  |  |  |  | 187,871 |  |  |  |
Weighted average grant date fair value, granted |  |  |  |  |  |  | $ 29.41 | $ 21.54 |  |  |
Unrecognized compensation expense |  |  |  |  |  |  | $ 3,481 |  |  |  |
Employee service share-based compensation, nonvested, period for recognition |  |  |  |  |  |  | 1 year 2 months 5 days |  |  |  |
Plan 2006 [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation award reserved for issuance of common shares |  |  | 4,500,000 | 3,000,000 | 1,500,000 |  |  |  |  |  |
Share-based compensation, increase in awards reserved for issuance of common shares |  |  | 1,500,000 | 1,500,000 |  |  |  |  |  |  |
Share-based compensation award, number of shares available for grant |  |  |  |  |  |  | 0 | 0 |  |  |
Share-based compensation restricted common shares issued |  |  |  |  |  |  | 295,381 |  |  |  |
Share-based compensation expiration date |  |  |  |  |  |  |  | May 01, 2016 |  |  |
Share-based compensation, maximum number of shares issuable |  |  |  |  | 500,000 |  |  |  |  |  |
Plan 2006 [Member] | Time Based Awards [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation award vesting period |  |  |  |  |  |  | 3 years | 3 years | 3 years |  |
Plan 2006 [Member] | Performance Based Awards [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation award vesting period |  |  |  |  |  |  | 3 years | 3 years | 3 years |  |
2016 Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation award reserved for issuance of common shares |  | 1,800,000 |  |  |  |  |  |  |  |  |
Share-based compensation award granted in period |  |  |  |  |  |  | 789,995 |  |  |  |
Share-based compensation award, number of shares available for grant |  |  |  |  |  |  | 1,063,691 |  |  |  |
2016 Plan [Member] | Time Based Awards [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation award granted in period |  |  |  |  |  |  | 316,970 |  |  |  |
Share-based compensation award vesting period |  |  |  |  |  |  | 3 years | 3 years | 3 years |  |
2016 Plan [Member] | Performance Based Awards [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation award granted in period |  |  |  |  |  |  | 473,025 |  |  |  |
Share-based compensation award vesting period |  |  |  |  |  |  | 3 years | 3 years | 3 years |  |
Director Share Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation award reserved for issuance of common shares | 850,000 |  | 700,000 |  |  | 500,000 |  |  |  |  |
Share-based compensation, increase in awards reserved for issuance of common shares | 150,000 |  | 200,000 |  |  |  |  |  |  |  |
Share-based compensation award vesting period |  |  |  |  |  |  |  |  | 1 year | 1 year | 1 year
Share-based compensation restricted common shares issued |  |  |  |  |  |  | 646,052 |  |  |  |
Share-based compensation, maximum number of shares issuable |  |  |  |  |  |  | 203,948 |  |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Date the equity-based award expires, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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